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File Created: 24-Jul-1985 by BC Geological Survey (BCGS)
Last Edit:  30-Nov-2013 by Karl A. Flower (KAF)

Summary Help Help

NMI
Name FAITH LAKE, RIM Mining Division Nanaimo
BCGS Map 092F063
Status Prospect NTS Map 092F11W
Latitude 049º 38' 57'' UTM 10 (NAD 83)
Longitude 125º 24' 55'' Northing 5502426
Easting 325656
Commodities Gold, Silver, Copper, Molybdenum, Lead, Zinc Deposit Types
Tectonic Belt Insular Terrane Wrangell, Plutonic Rocks
Capsule Geology

The Faith Lake occurrences are located over an approximately 500 by 600 metre area south and southeast of Faith Lake.

The area is primarily underlain by basalt of the Upper Triassic Vancouver Group, Karmutsen Formation which consists of flows, pillow breccia, aquagene tuff, and some thin sedimentary layers. This unit was intruded by a hornblende quartz diorite stock of the Late Eocene to Early Oligocene Mount Washington Intrusive Suite (formerly Catface Intrusions), then cut by a felsite sill. The dominant structures are steeply dipping, intersecting north and east trending shears and faults. Bedding is gently warped, with an average strike of 230 degrees and dip of 15 degrees north.

At least 30 veins have been examined within a 1.2 kilometre radius of the intrusive. Within the volcanics the veins fill the north and east trending structures as well as sheared intra-formational contacts. These veins vary in size from 5 to 10 centimetre wide lenses up to 0.6 to 1.2 metre wide veins fully exposed vertically through at least 600 metres. Undulating veins occupying intra-formational contacts, although rarely more than 0.46 metres in width, can be traced for distances measurable in kilometres. Where seen in the plutonic rock the veins parallel a master joint or fracture system which strikes 060 degrees and dips 70 degrees to the south.

The banded veins are generally composed of comb quartz plus occasional ankeritic carbonates, and massive to coarsely crystalline sulphides. The sulphides typically include arsenopyrite, chalcopyrite, pyrite, pyrrhotite, molybdenite, minor secondary chalcocite and possible bornite. In 1987, sampling of the Discovery vein assayed up to 37.71 grams per tonne gold and 274.6 grams per tonne silver over 20 centimetres (sample AD01351; Assessment Report 16866).

The Galena vein, a 30 centimetre thick and 20 metre long pod shaped vein emplaced along a shear between two basalt flows, was the only vein found that contained galena and sphalerite as well as chalcopyrite and arsenopyrite. A 15 centimetre drill interval assayed 24.69 grams per tonne gold, 120.00 gram per tonne silver and 3 per cent copper (McDougall, 1964). In 1987, sampling of the vein yielded up to 3.84 grams per tonne gold and 139.3 grams per tonne silver over 0.2 metres (sample AD01446 ;Assessment Report 16866).

Sampling of other veins, in the area, has yielded values up to 167.45 grams per tonne gold and 72.3 grams per tonne silver over 0.2 metres (sample AD01376; Assessment Report 16866).

In 1969, Falconbridge completed a ground self potential geophysical survey on the Faith and Rim claims. In 1987, Falconbridge completed a program of geological mapping, ground geophysical surveys and rock and soil sampling.

Bibliography
EMPR ASS RPT 2053, *16866
EMPR EXPL 1988-C91
EMPR FIELDWORK 1988, pp. 61-74
EMPR PF (McDougall, J.J. (1962): Report on Rim Gold Deposit 1962;
*McDougall, J.J. (1964): Report on Faith Lake Gold-Copper 1963;
McDougall, J.J. (1964): Report on Faith Lake Gold 1964); Geology
maps, 1962 and 1964; Self potential map, 1969; Contour Map,
undated (scale, 1:5 000))
GSC MAP 2-1965; 17-1968; 1386A
GSC OF 463
GSC P 68-50, p.39; 72-44
Carson, D.J.T. (1968): Metallogenic Study of Vancouver Island With
Emphasis on the Relationships of Mineral Deposits to Plutonic
Rocks, Unpublished Ph.D. Thesis, Carleton University
Falconbridge File

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